<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>函数参数默认值</title>
</head>

<body>
    <script>

        /* 
         * ES6 允许给函数参数赋值初始值
         *    
         */

        // 1. 形参初始值 具有默认值的参数, 一般位置要靠后(潜规则)
        function add(a,b,c=10) {
            return a + b + c;
        }
        let result = add(1,2);
        console.log(result);

        // 2. 与解构赋值结合
        function connect({ host = "127.0.0.1", username, password, port }) {
            console.log(host)
            console.log(username)
            console.log(password)
            console.log(port)
        }
        connect({
            host: 'atguigu.com',
            username: 'root',
            password: 'root',
            port: 3306
        })
    </script>
</body>

</html>